Internal combustion engine



FIG. 1 is a front perspective view of a portion of an internalcombustion engine showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a top view thereof.

The broken line showing of environmental structure is for illustrativepurposes only and forms no part of the claimed design.

The ornamental design for an internal combustion engine, as shown. 